reftable/block: adjust type of the restart length

The restart length is tracked as a positive integer even though it
cannot ever be negative. Furthermore, it is effectively capped via the
MAX_RESTARTS variable.

Adjust the type of the variable to be `uint32_t`. While this type is
excessive given that MAX_RESTARTS fits into an `uint16_t`, other places
already use 32 bit integers for restarts, so this type is being more
consistent.

Signed-off-by: Patrick Steinhardt <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: pks-t

reftable/block.c

@@ -40,16 +40,15 @@ size_t footer_size(int version)
 static int block_writer_register_restart(struct block_writer *w, int n,
 					 int is_restart, struct reftable_buf *key)
 {
-	int rlen, err;
+	uint32_t rlen;
+	int err;
 
 	rlen = w->restart_len;
-	if (rlen >= MAX_RESTARTS) {
+	if (rlen >= MAX_RESTARTS)
 		is_restart = 0;
-	}
 
-	if (is_restart) {
+	if (is_restart)
 		rlen++;
-	}
 	if (2 + 3 * rlen + n > w->block_size - w->next)
 		return -1;
 	if (is_restart) {
@@ -148,8 +147,7 @@ int block_writer_add(struct block_writer *w, struct reftable_record *rec)
 
 int block_writer_finish(struct block_writer *w)
 {
-	int i;
-	for (i = 0; i < w->restart_len; i++) {
+	for (uint32_t i = 0; i < w->restart_len; i++) {
 		put_be24(w->block + w->next, w->restarts[i]);
 		w->next += 3;
 	}

reftable/reftable-writer.h

@@ -84,7 +84,7 @@ struct reftable_block_stats {
 	/* total number of entries written */
 	int entries;
 	/* total number of key restarts */
-	int restarts;
+	uint32_t restarts;
 	/* total number of blocks */
 	int blocks;
 	/* total number of index blocks */